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GA0383P02 Rev. C
Modes of Operation
Startup
The GCM-A initializes the display mode to local and all relays to the de-energized position.
The GCM-A executes a “power-on self test” (POST) to verify its proper operation. It verifies
its software by checksum testing the contents of its read-only memory (ROM). It tests all of
its power supplies and all of its relays. It verifies the sampler system, vacuum pump and
rotary valve. It checks the water system and the ambient and generator airflow rates.
The POST will take about 30 seconds to complete if no errors are encountered. At the
conclusion of the POST, the GCM-A display panel will flash STARTING CHAMBER for two
seconds before beginning normal operation. If the FN key is pressed while it is still flashing,
normal operation will be canceled and the GCM-A will enter suspended operation instead.
Startup Problems
The GCM-A verifies its software by checksum testing the contents of its read only memory
(ROM). If it finds a problem it will stop the POST process and flash BAD CHECKSUM on the
LCD. The FN key may be pressed to allow the GCM-A to continue the POST process.
However, proper operation cannot be guaranteed if this error is present.
The GCM-A will annunciate any problems it finds with the power supplies or relays. The
presence of one or more of these faults will not stop the POST process. However, they
should be corrected as soon as possible because they indicate a hardware problem.
· +5 VOLTS=N.N a flashing 5-volt power supply voltage indicates that the 5-volt power
supply is out of specification.
· +6 VOLTS=N.N a flashing 6-volt power supply voltage indicates that the 6-volt power
supply is out of specification.
· +15 VOLTS=N.N a flashing 15-volt power supply voltage indicates that the 15-volt power
supply is out of specification.
· -15 VOLTS=N.N a flashing -15 volt power supply voltage indicates that the -15 volt
power supply is out of specification.
· The GCM-A will annunciate any problems it finds with the submicron particle detector.
The GCM-A will pause on each error and wait for the operator to acknowledge the error
by pressing the FN key.
· BAD ROTARY VALVE indicates a problem with the cloud chamber rotary valve or optical
interrupter.
· BAD VACUUM indicates that the vacuum pump could not provide at least 8 inches of
vacuum to the cloud chamber.
· PLUGGED SAMPLE LINE indicates a loose rotary valve or a plugged sample line.
· AMB FLO=N.N LPM a flashing airflow indicates that the airflow indicated is less than the
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